Most gambling websites depend on so called pseudo-random number generators. Ethex doesn’t use any number generators. Instead, it relies on public blockchain data (block hash). Block hash is generated independently by billions of miners and only after your transaction is included in the very same block.
If you compare Ethex with traditional lotteries it has much higher chances to win. Each lottery has it’s own mechanics, yet the most of them lowers their prize rates a lot. You can check it yourself comparing the wining chances of lotteries on different “bet vs prize” combinations. As an example we will take one of the most known lottery in the USA. Player needs to select 5 numbers from 1 to 70 (white balls) and 1 number from 1 to 25 (gold ball). The ticket costs $2, and to win i.e. $4 you need to guess one white ball and a gold ball. The winning chance is 1 to 89. Playing Ethex you can double your bet if you guess just “any letter”. Winning chance is 1 to 2.7. It says Ethex has 33 times more chances to win 😉
Placing a bet on Ethex has a much lower transaction fee compared to similar websites − this allows supporting bets as low as 0.01 ETH. Ethex is very simple and easily understandable.